Other Answers

I believe you have to hit the switch in the coffin behind Mad Monster Mansion via turning into the pumpkin, leaving MMM and then going through the door, changing back and breaking the coffin lid with the beak buster move. After that, you go to the RBB area and there is some sorta air duct or something in the corner and you go through there and when you get to the Honeycomb thing break the vent on the wall. And there you go.

I believe you have to hit the switch in the coffin behind Mad Monster Mansion via turning into the pumpkin, leaving MMM and then going through the door, changing back and breaking the coffin lid with the beak buster move. After that, you go to the RBB area and there is some sorta air duct or something in the corner and you go through there and when you get to the Honeycomb thing break the vent on the wall. And there you go.